JEE Main 2019 — Chemistry solution

JEE Main2019Chemistry

For the cell Zn(s)|Zn²⁺(aq)||M^x+(aq)| M(s), different half cells and their standard electrode potentials are given below

If $E^{o}_{z n^{2 +} /zn} = - 0 .76 V,$ which cathode will give a maximum value of $E^{o}_{Cell}$ per electron transferred?

A
Fe²⁺/Fe
B
Ag⁺/Ag
C
Fe³⁺/Fe²⁺
D
Au³⁺/Au

Solution

$E^{o}_{Cell} = (E^{o}_{R .P .})_{Cathode} - (E^{o}_{R .P .})_{Anode}$

All electrodes act as cathode w.r.t. Zn so the ion which has highest reduction potential will give maximum value of E°_cellso Au³⁺/Au produce highest E°_cell.

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